PHOTOS: Usain Bolt's Girlfriend Cheers Him On

Usain Bolt crossed the line to claim his eighth Olympic gold last night in Rio to roars of the crowd - but his biggest fan was cheering him on from home. 

Kasi Bennett, who is believed to be Bolt's girlfriend, has celebrated every one of his sensational victories with almost tangible excitement.

But her social media pages make it clear there was no doubt in her mind that Bolt's Olympics would be anything less than historic.

'My babbbbbbbbbbbyyyyyyyyyyy!!!' she cheered after he won his third 100m gold medal on Sunday night, adding 'Wha dem a guh do yah now?'

She followed it with a series of cheering hands, Jamaican flags and love hearts with the hashtag 'Living Legend'.

Last night, when the Olympian added a third 200m gold to his collection, she added: 'This level of pride is unfathomable.' 

Bolt easily swept his competition and stormed home to clinch the 200m gold in a time of 19.78s. 

When he crossed the line, however, Bolt looked bitterly disappointed about his victory - after he failed to beat his own world record of 19.19s.  

'The sadness for me would be that it is actually a slower time. I really wanted to run faster but I came out here to win,' he said.